v.: OE (h)wistlian to make hissing sound ← Gmc χwis- (ON hvisla to whisper) ← IE kwei-🔗⭐🔉

v.: OE (h)wistlian to make hissing sound ← Gmc χwis- (ON hvisla to whisper) ← IE kwei- to hiss, whistle 《擬音語》: cf. whisper. ― n.: OE (h)wistle whis・tle・a・ble /(h)wsb, -sl-/

研究社新英和大辞典 ページ 234442 での【hON hvisla to whisper】単語。